CN107558962A - Concentric tube type batch-type gaslift drainage technology - Google Patents

Concentric tube type batch-type gaslift drainage technology Download PDF

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Publication number
CN107558962A
CN107558962A CN201710601819.7A CN201710601819A CN107558962A CN 107558962 A CN107558962 A CN 107558962A CN 201710601819 A CN201710601819 A CN 201710601819A CN 107558962 A CN107558962 A CN 107558962A
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China
Prior art keywords
concentric tube
pressure
gcu
coal bed
oil pipe
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Pending
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CN201710601819.7A
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Chinese (zh)
Inventor
郝春生
季长江
信凯
陈召英
杨昌永
常会珍
于振锋
李军军
姚晋宝
赵晋斌
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Shanxi Jincheng Anthracite Mining Group Co Ltd
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Shanxi Jincheng Anthracite Mining Group Co Ltd
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Priority to CN201710601819.7A priority Critical patent/CN107558962A/en
Publication of CN107558962A publication Critical patent/CN107558962A/en
Pending legal-status Critical Current

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Abstract

The invention belongs to cbm development and mining technical field, it is low in low-yield water coal bed gas well or coal bed gas well mining later stage liquid level for existing coal bed gas well mining technology, aquifer yield is few, oil pumper is caused to dally, the problems such as dry grinding, the invention provides a kind of concentric tube type batch-type gaslift drainage technology, the technique is completed by concentric tube gas lift system, described concentric tube gas lift system includes moisture trap, GCU, supercharger and concentric tube column, moisture trap, GCU, supercharger is mounted on ground, moisture trap is connected by pipeline with coal bed gas well, concentric tube column is installed in coal bed gas well.The gases at high pressure of injection act only on oil pipe with the closing space of hollow beam hanger annular space, avoiding gases at high pressure and impurity being pressed into cracks in coal seam, injure reservoir;The keying for comparing feedback arrangement signal and controlling concentric tube gas lift system of operating pressure is preset by levels pressure in coal bed gas well and GCU.

Description

Concentric tube type batch-type gaslift drainage technology
Technical field
The invention belongs to cbm development and mining technical field, and in particular to a kind of concentric tube type batch-type gaslift draining Technique.
Background technology
In low yield pool or the mining later stage of coal bed gas well, because stratum supply capacity is weak, coal bed gas well fluid column rises slow Slowly, conventional sucker rod pump drainage efficiency is low, it is necessary to which oil pumper long time running could discharge partially liq outside well.Oil pumper Long-term poorly efficient idle running, not only causes energy waste, can also increase the degree of wear of machine.And gaslift process drain efficiency high, and Small, the mining available in this case coal bed gas well by depth, the influence degree of hole deviation.But existing gaslift technique is mostly gaslift Valve type gaslift, the technique downhole tool is more, and gas lift valve safeguards that replacing is cumbersome, and investment is also of a relatively high.Simultaneously as coal bed gas Well interval of interest sleeve pipe is shot through, and some coal bed gas wells have multiple target zones.In gases at high pressure injection process, it should also keep away Exempt from gas and enter reservoir from preforation tunnel, not only cause gases at high pressure loss, gaslift can not be smoothly completed, can also be by water, coal In the press-in reservoir fracture such as powder, potential injury is brought to reservoir.Therefore, a kind of simple, efficient, energy-conservation water discharge technology is needed badly, To meet the efficient mining of the mining later stage coal bed gas well in low yield pool or coal bed gas well.And concentric tube type batch-type gaslift draining Technique, then it can preferably meet the demand.
The content of the invention
Shanxi Jincheng Anthracite Mining Industry Group Co., Ltd.'s coal is with coal bed gas Gong Cai National Key Laboratories for existing There is coal bed gas well mining technology low-yield water coal bed gas well or coal bed gas well mining later stage liquid level be low, aquifer yield is few, cause to pump The problems such as machine idle running, dry grinding, and then provide a kind of concentric tube type batch-type gaslift drainage technology.
The present invention adopts the following technical scheme that:
A kind of concentric tube type batch-type gaslift drainage technology, the technique are completed by concentric tube gas lift system, described concentric tube Gas lift system includes moisture trap, GCU, supercharger and concentric tube column, moisture trap, GCU, Supercharger is mounted on ground, and supercharger is connected with GCU, and moisture trap is connected by pipeline with coal bed gas well, Concentric tube column is installed in coal bed gas well;
The gases at high pressure of injection are acted only in the closing space of oil pipe and hollow beam hanger annular space, and gases at high pressure are not during gaslift It can avoid gases at high pressure that impurity is pressed into cracks in coal seam from casing wall perforated interval loss, injure reservoir;
Pass through levels pressure in coal bed gas well(Oil pipe and the pressure in hollow beam hanger annular space)Work is preset with GCU The keying for comparing feedback arrangement signal control concentric tube gas lift system of pressure.
Described concentric tube column includes oil pipe, hollow beam hanger, standing valve and screen casing, and standing valve is installed on oil pipe bottom, Gu Determine valve bottom connection screen casing, hollow oil pipe is concentrically mounted in oil pipe, and hollow oil pipe bottom is provided with pressure bomb, underground pressure Power meter is connected with GCU.
Specific construction technique is as follows:
Tripping in concentric tube column in coal bed gas well, the standing valve of concentric tube column is set to be located at more than purpose roof;
According to the critical desorption pressures and aquifer yield of coal bed gas well, the startup operating pressure of GCU is set;
Before gaslift draining, the liquid in coal seam makes the liquid of oil jacket annular space, oil pipe and hollow beam hanger annular space by standing valve and screen casing Face mutually maintains an equal level, and when bottom pressure is above the ground level the default startup operating pressure of control device, bottom hole pressure bomb is by pressure signal Reach GCU and control gas lift system to open, natural gas is pressed into well by compressor from oil pipe and hollow beam hanger annular space Interior, standing valve is closed, and liquid is enumerated ground from hollow beam hanger, and gas-liquid separation is carried out into moisture trap;
When bottom pressure is reduced to below the default startup operating pressure of GCU, gaslift stops, and bleeds off injection Gas, now standing valve opened in the presence of oil jacket annular space head of liquid, coal seam water is mended again by bottom screen casing, standing valve It is charged in oil pipe and hollow beam hanger, oil jacket annular space, the liquid level of oil pipe and hollow beam hanger annular space is reached new balance;
When bottom pressure reaches the default startup operating pressure of GCU, gas lift system is again started up, and opens new one The gaslift of wheel, so circulation, so as to realize the batch (-type) of coal bed gas well, automation mining.
The present invention has advantages below:
(1)The mining efficiency of coal bed gas well is improved, reduces energy resource consumption.Conventional sucker rod pump mining technology is efficiently solved low When producing pool or low coal bed gas well mining later stage aquifer yield, the low problem of drainage efficiency.Due to stratum moisturizing ability, oil pumper Long time running is needed, well inside points liquid could be discharged outside well.The long-term poorly efficient idle running of oil pumper, sucker rod pump is caused to do for a long time Mill, notable infringement is brought to machine.Meanwhile also create substantial amounts of power wastage.
(2)The risk of gaslift gas leakage is reduced, reduces potential injury of the gases at high pressure to coal seam reservoirs.Due to concentric oil tubes and admittedly Determine the presence of valve, having ensured the gas of injection can only act in the annular space of oil pipe and hollow beam hanger.Even if coal seam section is penetrated Hole eyelet, gases at high pressure also will not the gas leakage from eyelet.Gases at high pressure can also be avoided by liquid, coal dust and quartz sand etc. simultaneously It is pressed into cracks in coal seam, injures reservoir.
(3)Due to the presence of ground batch (-type) control system, avoid after liquid is fully drained in coal bed gas well, high pressure Gas still constantly injects, and causes the idle running of gas lift system and forms waste.The set system underground equipment is few, Operation and Maintenance letter It is single, the cost of gaslift is reduced, has ensured the Effec-tive Function of gas lift system.
Brief description of the drawings
Fig. 1 is the structural representation of concentric tube column;
Fig. 2 is the connection diagram of concentric tube gas lift system;
In figure:1- moisture traps, 2- GCUs, 3- superchargers, 4- sleeve pipes, 5- oil jackets annular space, 6- oil pipes, 7- oil pipes With hollow beam hanger annular space, the hollow beam hangers of 8-, 9- pressure bombs, 10- hoops, 11- standing valves, 12- screen casings, 13- coal seams.
Embodiment
With reference to accompanying drawing, the embodiment of the present invention is described further:
(1)Fig. 1 is concentric tube column structural representation, and the device mainly avoids during gaslift gases at high pressure from casing wall perforation Section loss, and injury is produced to purpose reservoir.When gaslift gases at high pressure are by out of oil pipe and hollow beam hanger annular space press-in well, Bottom standing valve is closed, and pressure is only acted in the closing space of oil pipe and hollow beam hanger annular space.When liquid level is reduced to gaslift work When making below pressure, gaslift stops, and bleeds off injection gas.Now standing valve is opened in the presence of oil jacket annular space head of liquid, Coal seam water is added in oil pipe and hollow beam hanger again by bottom screen casing, standing valve.Liquid level between hollow beam hanger, oil pipe and sleeve pipe Reach new balance, when bottom pressure reaches the operating pressure of gaslift setting, monitored by bottom hole pressure bomb, pass to ground control System, gaslift are carried out again.
(2)Fig. 2 is concentric tube type batch-type gaslift drainage technology connection diagram.When bottom pressure reaches gaslift setting During operating pressure, GCU starts, gaslift natural gas be pressurized by ground supercharger after from oil pipe and hollow beam hanger Annular space is injected, and standing valve is closed, and liquid is enumerated ground through hollow beam hanger, into moisture trap.The gas isolated is again It is pressed into as gaslift with source of the gas in well.When the water isolated reaches setting height in moisture trap, by automatic-discharging.Oil A coal bed gas part for set annular space output is used as the source of the gas of gaslift, and remainder then enters gathering line.Work as bottom pressure Less than GCU setting startup pressure when, stop gas injection, bleed off injection gas.Now standing valve is opened, in coal seam Liquid is entered in oil pipe by screen casing, standing valve, the liquid level between hollow beam hanger, oil pipe and sleeve pipe is reached new balance.
The Specific construction technical process of the present invention is as follows:
(1)Standing valve is installed in oil pipe bottom, and connects screen casing in standing valve bottom, prevents bulky grain coal dust from being caused into standing valve Block(See accompanying drawing 1).
(2)The hollow beam hanger composition concentric tube column of tripping in oil pipe, and bottom hole pressure bomb is installed in hollow beam hanger bottom, make For the core building block of the technique.
(3)According to coal seam depth, concentric tube column is lowered into correct position, the standing valve of concentric tube column is located at purpose coal It is more than layer top plate.
(4)According to coal bed gas well critical desorption pressures and production regimen condition, the startup work of initial setting GCU Pressure.
(5)Before gaslift draining, the liquid in coal seam makes oil jacket annular space, oil pipe and hollow beam hanger ring by standing valve and screen casing Empty liquid level mutually maintains an equal level.When startup pressure of the bottom pressure higher than setting, natural gas is by compressor from oil pipe and hollow beam hanger Annular space is pressed into, and liquid is from hollow beam hanger output.When startup pressure of the bottom pressure less than ground installation setting, stop gas injection, Bleed off injection gas.
(6)When the head of liquid in oil pipe and hollow beam hanger annular space reaches the startup pressure of ground installation, ground injection Equipment starts, and new round gaslift starts.So go round and begin again and the gas-liquid mixture in coal seam is discharged ground, reach water pumping gas production Purpose.So as to realize the batch (-type) of coal bed gas well, automation, high efficiency mining.
Concentric tube type batch-type gaslift drainage technology drainage effect of the present invention is preferable, can both avoid conventional sucker rod pump Dally, wear when liquid level is low, cause power wastage.Simultaneously as the gas of injection can only act on more than standing valve, so as to It effectively prevent gases at high pressure liquid, coal dust and quartz sand etc. are pressed into cracks in coal seam, injure reservoir.Oil pipe and hollow beam hanger It is a closing space during gaslift, can effectively prevents gases at high pressure from well-case perforating section pressure release.The technique be it is a kind of it is new, Efficiently, the coal bed gas well water drainage-gas recovery technology of energy-conservation.

Claims (3)

  1. A kind of 1. concentric tube type batch-type gaslift drainage technology, it is characterised in that:The technique is completed by concentric tube gas lift system, Described concentric tube gas lift system includes moisture trap, GCU, supercharger and concentric tube column, moisture trap, GCU, supercharger are mounted on ground, and supercharger is connected with GCU, moisture trap by pipeline with Coal bed gas well is connected, and concentric tube column is installed in coal bed gas well;
    The gases at high pressure of injection are acted only in the closing space of oil pipe and hollow beam hanger annular space, and gases at high pressure are not during gaslift It can avoid gases at high pressure that impurity is pressed into cracks in coal seam from casing wall perforated interval loss, injure reservoir;
    The comparison feedback arrangement signal control that operating pressure is preset by levels pressure in coal bed gas well and GCU is same The keying of heart pipe gas lift system.
  2. 2. concentric tube type batch-type gaslift drainage technology according to claim 1, it is characterised in that:Described concentric tube column Including oil pipe, hollow beam hanger, standing valve and screen casing, standing valve is installed on oil pipe bottom, standing valve bottom connection screen casing, hollow oil Pipe is concentrically mounted in oil pipe, and hollow oil pipe bottom is provided with pressure bomb, and pressure bomb is connected with GCU.
  3. 3. concentric tube type batch-type gaslift drainage technology according to claim 2, it is characterised in that Specific construction technique is such as Under:
    Tripping in concentric tube column in coal bed gas well, the standing valve of concentric tube column is set to be located at more than purpose roof;
    According to the critical desorption pressures and aquifer yield of coal bed gas well, the startup operating pressure of GCU is set;
    Before gaslift draining, the liquid in coal seam makes the liquid of oil jacket annular space, oil pipe and hollow beam hanger annular space by standing valve and screen casing Face mutually maintains an equal level, and when bottom pressure is above the ground level the default startup operating pressure of control device, bottom hole pressure bomb is by pressure signal Reach GCU and control gas lift system to open, natural gas is pressed into well by compressor from oil pipe and hollow beam hanger annular space Interior, standing valve is closed, and liquid is enumerated ground from hollow beam hanger, and gas-liquid separation is carried out into moisture trap;
    When bottom pressure is reduced to below the default startup operating pressure of GCU, gaslift stops, and bleeds off injection Gas, now standing valve opened in the presence of oil jacket annular space head of liquid, coal seam water is mended again by bottom screen casing, standing valve It is charged in oil pipe and hollow beam hanger, oil jacket annular space, the liquid level of oil pipe and hollow beam hanger annular space is reached new balance;
    When bottom pressure reaches the default startup operating pressure of GCU, gas lift system is again started up, and opens new one The gaslift of wheel, so circulation, so as to realize the batch (-type) of coal bed gas well, automation mining.
CN201710601819.7A 2017-07-21 2017-07-21 Concentric tube type batch-type gaslift drainage technology Pending CN107558962A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109025911A (en) * 2018-08-23 2018-12-18 山西晋城无烟煤矿业集团有限责任公司 A kind of coal bed gas well gaslift draining reservoir protection device and water discharge method
CN109798095A (en) * 2019-03-08 2019-05-24 南阳市天达同兴石油技术有限公司 A kind of coal-bed-gas production-increase pressure disturbance device and method for increasing yield of coal bed gas
CN111042774A (en) * 2019-12-25 2020-04-21 山西晋城无烟煤矿业集团有限责任公司 Method for switching whole cylinder pump and gas lift extraction mode without sleeve pressure unloading
CN112855088A (en) * 2021-04-06 2021-05-28 中联煤层气有限责任公司 Method for improving gas production rate of coal bed
CN113027389A (en) * 2021-04-01 2021-06-25 中勘资源勘探科技股份有限公司 Double-ring air-pressure boosting type water lifting pipeline connecting structure and water lifting method thereof

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CN1648405A (en) * 2004-12-22 2005-08-03 西南石油学院 Injecting air boosting oil production and liquid discharging gas producing device and method
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CN202064905U (en) * 2011-05-13 2011-12-07 中国石油天然气股份有限公司 Gas lifting and liquid discharging device for vehicle natural gas compressor
CN102472089A (en) * 2009-06-29 2012-05-23 国际壳牌研究有限公司 System and method for intermittent gas lift
CN203559876U (en) * 2013-10-29 2014-04-23 中国石油化工股份有限公司 Closed gas-lift liquid discharge combined tubing string for low-pressure oil and gas well
CN105863567A (en) * 2015-11-02 2016-08-17 北京泰斯特威尔技术有限公司 Pressure controlling and air lifting drainage gas recovery equipment and method
US9556710B2 (en) * 2002-07-16 2017-01-31 Onesubsea Ip Uk Limited Apparatus and method for recovering fluids from a well and/or injecting fluids into a well

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CN1132820A (en) * 1994-10-14 1996-10-09 巴西石油公司 Method and apparatus forintermittent production of oil with mechanical interface
US9556710B2 (en) * 2002-07-16 2017-01-31 Onesubsea Ip Uk Limited Apparatus and method for recovering fluids from a well and/or injecting fluids into a well
CN1648405A (en) * 2004-12-22 2005-08-03 西南石油学院 Injecting air boosting oil production and liquid discharging gas producing device and method
CN102472089A (en) * 2009-06-29 2012-05-23 国际壳牌研究有限公司 System and method for intermittent gas lift
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109025911A (en) * 2018-08-23 2018-12-18 山西晋城无烟煤矿业集团有限责任公司 A kind of coal bed gas well gaslift draining reservoir protection device and water discharge method
CN109798095A (en) * 2019-03-08 2019-05-24 南阳市天达同兴石油技术有限公司 A kind of coal-bed-gas production-increase pressure disturbance device and method for increasing yield of coal bed gas
CN111042774A (en) * 2019-12-25 2020-04-21 山西晋城无烟煤矿业集团有限责任公司 Method for switching whole cylinder pump and gas lift extraction mode without sleeve pressure unloading
CN111042774B (en) * 2019-12-25 2021-08-20 山西晋城无烟煤矿业集团有限责任公司 Method for switching whole cylinder pump and gas lift extraction mode without sleeve pressure unloading
CN113027389A (en) * 2021-04-01 2021-06-25 中勘资源勘探科技股份有限公司 Double-ring air-pressure boosting type water lifting pipeline connecting structure and water lifting method thereof
CN112855088A (en) * 2021-04-06 2021-05-28 中联煤层气有限责任公司 Method for improving gas production rate of coal bed

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Application publication date: 20180109